<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        button {
  position: relative;
  padding: 10px 20px;
  border-radius: 7px;
  border: 1px solid rgb(61, 106, 255);
  font-size: 14px;
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 2px;
  background: transparent;
  color: #fff;
  overflow: hidden;
  box-shadow: 0 0 0 0 transparent;
  -webkit-transition: all 0.2s ease-in;
  -moz-transition: all 0.2s ease-in;
  transition: all 0.2s ease-in;
}

button:hover {
  background: rgb(61, 106, 255);
  box-shadow: 0 0 30px 5px rgba(0, 142, 236, 0.815);
  -webkit-transition: all 0.2s ease-out;
  -moz-transition: all 0.2s ease-out;
  transition: all 0.2s ease-out;
}

button:hover::before {
  -webkit-animation: sh02 0.5s 0s linear;
  -moz-animation: sh02 0.5s 0s linear;
  animation: sh02 0.5s 0s linear;
}

button::before {
  content: '';
  display: block;
  width: 0px;
  height: 86%;
  position: absolute;
  top: 7%;
  left: 0%;
  opacity: 0;
  background: #fff;
  box-shadow: 0 0 50px 30px #fff;
  -webkit-transform: skewX(-20deg);
  -moz-transform: skewX(-20deg);
  -ms-transform: skewX(-20deg);
  -o-transform: skewX(-20deg);
  transform: skewX(-20deg);
}

@keyframes sh02 {
  from {
    opacity: 0;
    left: 0%;
  }

  50% {
    opacity: 1;
  }

  to {
    opacity: 0;
    left: 100%;
  }
}

button:active {
  box-shadow: 0 0 0 0 transparent;
  -webkit-transition: box-shadow 0.2s ease-in;
  -moz-transition: box-shadow 0.2s ease-in;
  transition: box-shadow 0.2s ease-in;
}

    </style>
</head>
<body>
    <button>
        Button
    </button>
</body>
</html>